CN104319475B - Common-grounded edge rippled horizontal polarization broadband omnidirectional antenna array and adjusting method thereof - Google Patents
Common-grounded edge rippled horizontal polarization broadband omnidirectional antenna array and adjusting method thereof Download PDFInfo
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- CN104319475B CN104319475B CN201410630764.9A CN201410630764A CN104319475B CN 104319475 B CN104319475 B CN 104319475B CN 201410630764 A CN201410630764 A CN 201410630764A CN 104319475 B CN104319475 B CN 104319475B
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Abstract
Provided are a common-grounded edge rippled horizontal polarization broadband omnidirectional antenna array and an adjusting method of the common-grounded edge rippled horizontal polarization broadband omnidirectional antenna array. The antenna array comprises a circular dielectric slab, a power divider feed network, a public circular ring metal ground and an arc-shaped printed dipole array, wherein the circular dielectric slab is provided with a hole in the center, the power divider feed network is arranged on one surface of the circular dielectric slab and comprises a one-to-n eccentric equiamplitude same-phase power divider network and n feed microstrip lines, the public circular ring metal ground is arranged on the other surface of the circular dielectric slab and is concentric with the circular through hole, the arc-shaped printed dipole array is arranged on the other surface of the circular dielectric slab and composed of n arc-shaped printed dipoles which are evenly distributed in a circular ring shape, the middle of each arc-shaped printed dipole is connected with the public circular ring metal ground, and slits are formed in each arc-shaped printed dipole. According to the common-grounded edge rippled horizontal polarization broadband omnidirectional antenna array and the adjusting method for the common-grounded edge rippled horizontal polarization broadband omnidirectional antenna array, grooves are formed in the outer edge of each arc-shaped printed dipole, the outer edge of each arc-shaped printed dipole is made to be in a concave-convex rippled shape, and the out-of-roundness of radiation patterns of antennas is relieved.
Description
Technical field
The present invention relates to a kind of ground-tint side horizontal polarization wideband omnidirectional antenna battle array and its method of adjustment altogether, belong to mobile communication
The antenna of the institutions such as base station.
Background technology
With the development of mobile communication technology, it is desirable to which antenna for base station, local transfer antenna for base station etc. do not require nothing more than vertical pole
Change, and require horizontal polarization, not only require high band（1710MHz-2700MHz）For horizontal vertical dual polarization, and require
Low-frequency range（698MHz-960MHz）For horizontal vertical dual polarization, in order to smoothly realize the integration of horizontal polarization and vertical polarization
Design, it is desirable to which low-frequency range horizontally-polarized antenna out-of-roundness will get well, while there is perforation at center.Existing horizontally-polarized antenna technology is not
This requirement can be met.The present invention mainly overcomes the low-frequency range horizonally-polarized array row of this difficulty design, its out-of-roundness
Well, it is easy to integrated with vertical polarization, easy to process.
The content of the invention
It is contemplated that at least solving technical problem present in prior art.For this purpose, it is an object of the present invention to
Propose a kind of ground-tint side horizontal polarization wideband omnidirectional antenna battle array and its method of adjustment altogether.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of ground-tint side horizontal polarization wideband omnidirectional antenna battle array altogether of the present invention, including：
Circular media plate, there is a concentric manhole in the circular media plate；
Work(point feeding network, the work(point feeding network is located on a surface of the circular media plate, the work(point
Feeding network includes 1 pair of n bias constant amplitude homophase power division network and n feeding microstrip line, also, 1 couple of n bias constant amplitude homophases
Main split's initiating terminal of power division network is external interface, and the external interface deviates circular concentric through hole, and 1 pair of n bias constant amplitude is same
Each branches end of phase power division network is connected respectively with n feeding microstrip line, and n is 3,4,5 or 6；
Public annulus metal ground, is located on another surface of the circular media plate the public annulus metal, and
And, the public annulus metal ground is concentric with the circular concentric through hole, the public annulus metal and the 1 pair of n bias
Main split's initiating terminal connection of constant amplitude homophase power division network；With,
Circular arc printed dipole subarray, the circular dipole array is located at another table of the circular media plate
On face, the circular arc printed dipole subarray by the equally distributed n circular arc printed dipole of an annulus by being constituted and institute
The center of circle for stating annulus is concentric with the circular concentric through hole, the middle part of the circular arc printed dipole by metal micro-strip line with
The connection of public annulus metal ground, gap and the gap is provided with circular arc printed dipole and is located at circular arc printed dipole
On Axisymmetric Distributed Line；
1 couple of n bias constant amplitude homophase power division network is oppositely arranged with the public annulus metal, the n feed
Microstrip line is one-to-one with n circular arc printed dipole to be oppositely arranged.
A kind of method of adjustment of ground-tint side horizontal polarization wideband omnidirectional antenna battle array altogether of the present invention is first according to altogether
Stricture of vagina horizontal polarization wideband omnidirectional antenna battle array when the basic structure of horizontal polarization wideband omnidirectional antenna battle array prepares common ground-tint, then
Circular arc printed dipole in common ground-tint side horizontal polarization wideband omnidirectional antenna battle array is modified,
The basic structure of the ground-tint side horizontal polarization wideband omnidirectional antenna battle array altogether includes：
Circular media plate, there is a concentric manhole in the circular media plate；
Work(point feeding network, the work(point feeding network is located on a surface of the circular media plate, the work(point
Feeding network includes 1 pair of n bias constant amplitude homophase power division network and n feeding microstrip line, also, 1 couple of n bias constant amplitude homophases
Main split's initiating terminal of power division network is external interface, and the external interface deviates circular concentric through hole, and 1 pair of n bias constant amplitude is same
Each branches end of phase power division network is connected respectively with n feeding microstrip line, and n is equal to 3,4,5 or 6；
Public annulus metal ground, is located on another surface of the circular media plate the public annulus metal, and
And, the public annulus metal ground is concentric with the circular concentric through hole, the public annulus metal and the 1 pair of n bias
Main split's initiating terminal connection of constant amplitude homophase power division network；With,
Circular arc printed dipole subarray, the circular dipole array is located at another table of the circular media plate
On face, the circular arc printed dipole subarray by the equally distributed n circular arc printed dipole of an annulus by being constituted and institute
The center of circle for stating annulus is concentric with the circular concentric through hole, the middle part of the circular arc printed dipole by metal micro-strip line with
The connection of public annulus metal ground, gap and the gap is provided with circular arc printed dipole and is located at circular arc printed dipole
On Axisymmetric Distributed Line；
1 couple of n bias constant amplitude homophase power division network is oppositely arranged with the public annulus metal, the n feed
Microstrip line is one-to-one with n circular arc printed dipole to be oppositely arranged；
The side that circular arc printed dipole in described pair of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array is modified
Method is：
By being provided with groove on the outward flange of each circular arc printed dipole, the outside of circular arc printed dipole is made
Edge is presented asperities side shape, improves the out-of-roundness of radiation pattern, reduces the diameter of antenna array, increases the work of antenna array
Bandwidth.
Compared with prior art, the invention has the advantages that：
The present invention opens up a concentric manhole in circular media plate such that it is able to which vertical polarized antenna is worn
Cross the hole, it is easy to accomplish with vertical polarized antenna integrated design；In order to embody the advantage, the present invention gives by taking Fig. 3 as an example
A kind of horizontally-polarized antenna and vertical polarized antenna integral structure schematic diagram are gone out, vertical antenna is asymmetric double in the structure
Wimble structure antenna, the unsymmetrical double-cone structural antenna is made up of big frustum 6-1, little frustum 6-2 and feed line 6-3, big frustum
By feed line inner core through the present invention be total in ground-tint side horizontal polarization wideband omnidirectional antenna battle array 5 circular media plate central through hole with
Little frustum connection, realizes the integrated design of horizontal polarization and vertical polarized antenna.
The present invention passes through multiple circular arc printed dipoles to be connected with public annulus metal, so as to ensure that each circle
Arc printed dipole it is full symmetric reflectingly, be conducive to improving the out-of-roundness of Antenna Array Pattern, its out-of-roundness be less than 2dB
（In 698MHz-960MHz frequency ranges）, while public annulus metal ground is conducive to improving the gain of antenna, 0.5dB can be reached
More than.
The present invention is conducive to improving day by the way that multiple circular arc printed dipole outer edges are designed to asperities side shape
The out-of-roundness of beta radiation directional diagram, out-of-roundness improvement reaches 0.5dB or so, while reducing the straight of antenna array to a certain extent
Footpath, can reduce 5% or so, and increase the bandwidth of operation of antenna array, and in 693MHz to 968MHz, standing wave is respectively less than 1.5 for it.
The omnidirectional antenna array of the present invention is capable of achieving completely using printed circuit technology, without the need for additional auxiliary circuit and knot
Structure, therefore facility is processed, concordance is good, high yield rate.
The advantage of annular dielectric collar is the impact that the antenna pattern of antenna is not easily susceptible to antenna house.
To sum up, the present invention have that out-of-roundness is good, it is high gain, compact conformation, easy to process and be easy to and vertical polarized antenna
The advantage of integrated design.
Description of the drawings
The present invention above-mentioned advantage will be apparent from from the description with reference to accompanying drawings below to embodiment with it is easy to understand, its
In：
Fig. 1 is the overlooking structure figure of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array according to embodiments of the present invention；
Fig. 2 is the face upwarding assumption diagram of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array according to embodiments of the present invention；
Fig. 3 is that common ground-tint side horizontal polarization wideband omnidirectional antenna battle array according to embodiments of the present invention is vertical with unsymmetrical double-cone
The integrated morphology side view of polarization wideband omnidirectional antenna；
Fig. 4 is that the corresponding stationary wave characteristic of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array according to embodiments of the present invention is bent
Line chart；
When Fig. 5 is 0 degree of the corresponding elevation angle of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array according to embodiments of the present invention
The out-of-roundness curve chart of 698MHz；
When Fig. 6 is 0 degree of the corresponding elevation angle of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array according to embodiments of the present invention
The out-of-roundness curve chart of 800MHz；
When Fig. 7 is 0 degree of the corresponding elevation angle of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array according to embodiments of the present invention
The out-of-roundness curve chart of 900MHz；
When Fig. 8 is 60 degree of the corresponding elevation angle of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array according to embodiments of the present invention
The out-of-roundness curve chart of 960MHz；
Specific embodiment
Embodiment 1
A kind of ground-tint side horizontal polarization wideband omnidirectional antenna battle array altogether, including：
Circular media plate 1, there is a concentric manhole 1-1 in the circular media plate 1；
Work(point feeding network, the work(point feeding network is located on a surface of the circular media plate 1, the work(point
Feeding network includes 1 couple of n bias constant amplitude homophase power division network 2-1 and n feeding microstrip line 2-2, also, the 1 pair of n bias etc.
Main split's initiating terminal of width homophase power division network 2-1 is external interface 2-3, and the external interface 2-3 deviates circular concentric through hole
Each branches end of 1-1,1 couple of n bias constant amplitude homophase power division network is connected respectively with n feeding microstrip line 2-2, n for 3,4,5 or
6；
Public annulus metal ground 3, is located on another surface of the circular media plate 1 the public annulus metal,
Also, the public annulus metal ground 3 is concentric with the circular concentric through hole 1-1, the public annulus metal ground 3 and described 1
Main split's initiating terminal connection to n bias constant amplitude homophase power division network 2-1；With,
Circular arc printed dipole subarray, the circular dipole array is located at another of the circular media plate 1
On surface, the circular arc printed dipole subarray by the equally distributed n circular arc printed dipole 4-1 of an annulus by being constituted
And the center of circle of the annulus is concentric with the circular concentric through hole 1-1, the middle part of the circular arc printed dipole 4-1 is by gold
Category microstrip line is connected with public annulus metal ground 3, and gap 4-2 and the gap 4-2 are provided with circular arc printed dipole 4-1
On circular arc printed dipole 4-1 Axisymmetric Distributed Lines；
1 couple of n bias constant amplitude homophase power division network 2-1 are oppositely arranged with the public annulus metal ground 3, the n
Feeding microstrip line 2-2 and n circular arc printed dipole 4-1 is one-to-one to be oppositely arranged.
The present embodiment also adopts following technical measures, and it is further optimized：
Groove is provided with the outward flange of each circular arc printed dipole 4-1 and make circular arc printed dipole 4-1's
Outward flange is presented asperities side shape 4-3.
The outside of the circular media plate 1 stretches out to form annular Jie for inwardly containing circular arc printed dipole subarray
Matter flange 4-4.
Embodiment 2
A kind of method of adjustment of ground-tint side horizontal polarization wideband omnidirectional antenna battle array altogether, first according to ground-tint side horizontal polarization width altogether
Basic structure with omnidirectional antenna array prepares common ground-tint side horizontal polarization wideband omnidirectional antenna battle array, then to common ground-tint side level
Circular arc printed dipole 4-1 in polarization wideband omnidirectional antenna battle array is modified,
The basic structure of the ground-tint side horizontal polarization wideband omnidirectional antenna battle array altogether includes：
Circular media plate 1, there is a concentric manhole 1-1 in the circular media plate 1；
Work(point feeding network, the work(point feeding network is located on a surface of the circular media plate 1, the work(point
Feeding network includes 1 couple of n bias constant amplitude homophase power division network 2-1 and n feeding microstrip line 2-2, also, the 1 pair of n bias etc.
Main split's initiating terminal of width homophase power division network 2-1 is external interface 2-3, and the external interface 2-3 deviates circular concentric through hole
1-1, each branches end of 1 pair of n bias constant amplitude homophase power division network is connected respectively with n feeding microstrip line 2-2, and n is equal to 3,4,5
Or 6；
Public annulus metal ground 3, is located on another surface of the circular media plate 1 the public annulus metal,
Also, the public annulus metal ground 3 is concentric with the circular concentric through hole 1-1, the public annulus metal ground 3 and described 1
Main split's initiating terminal connection to n bias constant amplitude homophase power division network 2-1；With,
Circular arc printed dipole subarray, the circular dipole array is located at another of the circular media plate 1
On surface, the circular arc printed dipole subarray by the equally distributed n circular arc printed dipole 4-1 of an annulus by being constituted
And the center of circle of the annulus is concentric with the circular concentric through hole 1-1, the middle part of the circular arc printed dipole 4-1 is by gold
Category microstrip line is connected with public annulus metal ground 3, and gap 4-2 and the gap 4-2 are provided with circular arc printed dipole 4-1
On circular arc printed dipole 4-1 Axisymmetric Distributed Lines；
1 couple of n bias constant amplitude homophase power division network 2-1 are oppositely arranged with the public annulus metal ground 3, the n
Feeding microstrip line 2-2 and n circular arc printed dipole 4-1 is one-to-one to be oppositely arranged；
What the circular arc printed dipole 4-1 in described pair of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array was modified
Method is：
By being provided with groove on the outward flange of each circular arc printed dipole 4-1, circular arc printed dipole 4-1 is made
Outward flange asperities side shape 4-3 is presented, improve the out-of-roundness of radiation pattern, reduce the diameter of antenna array, increase day
The bandwidth of operation of linear array.
With reference to implement to grin and accompanying drawing the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
As shown in figure 1, a kind of ground-tint side horizontal polarization wideband omnidirectional antenna battle array altogether, the ground-tint side horizontal polarization broadband altogether
Omnidirectional antenna includes：There is a concentric manhole 1-1 at circular media plate 1, the center of circular media plate 1；Work(point feeding network,
The work(point feeding network is located at the lower section of the circular media plate 1, and the work(point feeding network includes that 1 pair 3 eccentric constant amplitude is same
Phase power division network 2-1 and feeding microstrip line 2-2, described 1 pair 3 eccentric constant amplitude homophase power division network is by each branches end connection feedback
Electric microstrip line 2-2, main split is external interface 2-3；Public annulus metal ground 3, the public annulus metal ground is located at the circle
Near the circular concentric through hole 1-1 sides, the 1 pair 3 bias constant amplitude homophase power division network 2-1 is located at the top of shape dielectric-slab 1
The public annulus metal ground 3 and the lower section of the circular media plate 1；Circular arc printed dipole subarray, the circular arc dipole
Subarray is located at the top of the circular media plate 1, is made up of 3 circular arc printed dipole 4-1, each described circular arc print
Brush dipole 4-1 is connected with the public annulus metal ground 3, and each circular arc printed dipole 4-1 centers have gap
4-2, the circular arc each printed dipole 4-1 outer edge be asperities side shape 4-3, each feeding microstrip line 2-2 with
Each printed dipole of circular arc 4-1 correspondences, positioned at the circular arc printed dipole 4-1 and the circular media plate 1
Lower section.
The thickness of circular media plate 1 is the refined imperial dielectric-slab ArlonAD255C of high frequency plate of 1.524mm, and relative dielectric constant is
2.55, loss angle tangent is 0.0014, and peripheral diameter is 265mm, and the aperture of circular concentric through hole is 10mm.
Work(point feeding network includes 1：3 constant amplitude homophase power splitter 2-1 and three feeding microstrip line 2-2, power splitter 2-1 master point
It is 50 ohm of output interfaces of standard to prop up 2-3, and work(point feeding network is formed by copper clad layers, thickness 35um.
Circular arc printed dipole subarray is made up of three circular arc printed dipole 4-1, each circular arc printing printing
Dipole 4-1 outer radius is 128mm, and inside radius is 93mm, and gap 4-2 depth is 57mm, and subtended angle is 94 degree, gap 4-2 width
For 3mm, each annular printed dipole 4-1 outer edge has 6 notches, constitutes stricture of vagina side, and depth of rebate is 5mm, width subtended angle
For 2 degree, annular printed dipole is copper clad layers, and thickness is 35 microns.Three annular printed dipole 4-1 are by circle
The center of dielectric-slab 1 extends, and public annulus metal ground 3 connects, and constitutes an entirety.3 external diameters of public annulus metal ground are 77mm,
Internal diameter is 33mm, is that the copper clad layers of 35 microns of thickness are constituted.
The frequency range of the present embodiment correspondence standing wave 1.5 is 693MHz-968MHz, as shown in figure 4, all frequency gains in frequency band
More than 1.5dB, out-of-roundness is respectively less than 1.8dB, as shown in Fig. 5, Fig. 6, Fig. 7 and Fig. 8.
Above-described embodiment is an exemplary embodiment of the present invention, but embodiments of the present invention do not receive above-mentioned enforcement
The restriction of example, change, modification, replacement, combination, the simplification made under other any principles without departing from the present invention, should be
Equivalent substitute mode, is included within protection scope of the present invention.
Claims (3)
1. it is a kind of to be total to ground-tint side horizontal polarization wideband omnidirectional antenna battle array, it is characterised in that to include：
Circular media plate（1）, the circular media plate（1）In have a concentric manhole（1-1）；
Work(point feeding network, the work(point feeding network is located at the circular media plate（1）A surface on, the work(point feedback
Electric network includes 1 pair of n bias constant amplitude homophase power division network（2-1）With n feeding microstrip line（2-2）, also, the 1 pair of n bias
Constant amplitude homophase power division network（2-1）Main split's initiating terminal be external interface（2-3）, the external interface（2-3）Deviate concentric
Manhole（1-1）, each branches end of 1 couple of n bias constant amplitude homophase power division network respectively with n feeding microstrip line（2-2）Even
Connect, n is 3,4,5 or 6；
Public annulus metal ground（3）, it is located at the circular media plate the public annulus metal（1）Another surface on,
Also, the public annulus metal ground（3）With the circular concentric through hole（1-1）With one heart, the public annulus metal ground（3）With
1 couple of n bias constant amplitude homophase power division network（2-1）The connection of main split initiating terminal；With,
Circular arc printed dipole subarray, the circular dipole array is located at the circular media plate（1）Another table
On face, the circular arc printed dipole subarray is by by the equally distributed n circular arc printed dipole of an annulus（4-1）Constitute
And the center of circle of the annulus and the circular concentric through hole（1-1）With one heart, the circular arc printed dipole（4-1）Middle part lead to
Metal micro-strip line is crossed with public annulus metal ground（3）Connection, in circular arc printed dipole（4-1）It is provided with gap（4-2）And
The gap（4-2）Positioned at circular arc printed dipole（4-1）On Axisymmetric Distributed Line；
1 couple of n bias constant amplitude homophase power division network（2-1）With the public annulus metal ground（3）It is oppositely arranged, the n
Feeding microstrip line（2-2）With n circular arc printed dipole（4-1）It is one-to-one to be oppositely arranged；
In each circular arc printed dipole（4-1）Outward flange be provided with groove and make circular arc printed dipole（4-1）'s
Outward flange is presented asperities side shape（4-3）, reduce the diameter of antenna array and increase the bandwidth of operation of antenna array.
2. it is according to claim 1 to be total to ground-tint side horizontal polarization wideband omnidirectional antenna battle array, it is characterised in that circular Jie
Scutum（1）Outside stretch out to form the annular dielectric collar for inwardly containing circular arc printed dipole subarray（4-4）.
3. a kind of method of adjustment of altogether ground-tint side horizontal polarization wideband omnidirectional antenna battle array, it is characterised in that first according to ground-tint side altogether
The basic structure of horizontal polarization wideband omnidirectional antenna battle array prepares common ground-tint side horizontal polarization wideband omnidirectional antenna battle array, then to altogether
Circular arc printed dipole in the horizontal polarization wideband omnidirectional antenna battle array of ground-tint side（4-1）It is modified,
The basic structure of the ground-tint side horizontal polarization wideband omnidirectional antenna battle array altogether includes：
Circular media plate（1）, the circular media plate（1）In have a concentric manhole（1-1）；
Work(point feeding network, the work(point feeding network is located at the circular media plate（1）A surface on, the work(point feedback
Electric network includes 1 pair of n bias constant amplitude homophase power division network（2-1）With n feeding microstrip line（2-2）, also, the 1 pair of n bias
Constant amplitude homophase power division network（2-1）Main split's initiating terminal be external interface（2-3）, the external interface（2-3）Deviate concentric
Manhole（1-1）, each branches end of 1 couple of n bias constant amplitude homophase power division network respectively with n feeding microstrip line（2-2）Even
Connect, n is equal to 3,4,5 or 6；
Public annulus metal ground（3）, it is located at the circular media plate the public annulus metal（1）Another surface on,
Also, the public annulus metal ground（3）With the circular concentric through hole（1-1）With one heart, the public annulus metal ground（3）With
1 couple of n bias constant amplitude homophase power division network（2-1）The connection of main split initiating terminal；With,
Circular arc printed dipole subarray, the circular dipole array is located at the circular media plate（1）Another table
On face, the circular arc printed dipole subarray is by by the equally distributed n circular arc printed dipole of an annulus（4-1）Constitute
And the center of circle of the annulus and the circular concentric through hole（1-1）With one heart, the circular arc printed dipole（4-1）Middle part lead to
Metal micro-strip line is crossed with public annulus metal ground（3）Connection, in circular arc printed dipole（4-1）It is provided with gap（4-2）And
The gap（4-2）Positioned at circular arc printed dipole（4-1）On Axisymmetric Distributed Line；
1 couple of n bias constant amplitude homophase power division network（2-1）With the public annulus metal ground（3）It is oppositely arranged, the n
Feeding microstrip line（2-2）With n circular arc printed dipole（4-1）It is one-to-one to be oppositely arranged；
Circular arc printed dipole in described pair of common ground-tint side horizontal polarization wideband omnidirectional antenna battle array（4-1）The side being modified
Method is：
By in each circular arc printed dipole（4-1）Outward flange be provided with groove, make circular arc printed dipole（4-1）
Outward flange asperities sides shape is presented（4-3）, improve the out-of-roundness of radiation pattern.
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| CN201410630764.9A CN104319475B (en) | 2014-11-11 | 2014-11-11 | Common-grounded edge rippled horizontal polarization broadband omnidirectional antenna array and adjusting method thereof |
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| CN103811857B (en) * | 2014-01-21 | 2017-01-11 | 盛宇百祺（南京）通信技术有限公司 | Vertical polarization omnidirectional antenna and 4G dual polarization omnidirectional ceiling antenna with same |
| CN204167475U (en) * | 2014-11-11 | 2015-02-18 | 苏州市天烨机械工程有限公司 | Horizontally polarized omnidirectional antenna altogether |
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2014
- 2014-11-11 CN CN201410630764.9A patent/CN104319475B/en active Active
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